The Shift Knob on the CVT Auto does not Screw-On / Screw-Off.
It Pulls-Off (upwards)
It's held in place by a strongish Internal Spring Clip.
Removal Method of Factory Knob:
* Place Shifter in Neutral position.
* Take a Firm Hold at the Base of the Knob with both hands.
* Pull Upward with Force.
* The Spring Clips inside the Factory Knob will expand and allow the Knob to Slide Up & Off the Shifter Rod.
This takes a Moderate Amount of Force To Do ... So be Persistent & Dont Just Give-Up after your first attempt.
Here is a YouTube Vid from 9Glancers that kinda explains how it's done:
2008+ Lancer - HOW TO: Take off Automatic CVT Shift Knob
Refit Method for Factory Knob:
Simply Place the Knob on the Shifter Rod & Push Down Firmly ... you will Hear & Feel a Distinct "Click" indicating the Spring Clip has Located & Engaged.
After-Market Knobs
"DO-NOT" have the same Spring Clip which is in the Factory Knob.
They instead come supplied with an assortment of different size Plastic Sleeves & Small Grub Screws.
* You simply select the Sleeve that Best & Neatly Fits your Selector Rod.
* Insert the Sleeve into your new Knob.
* Slide the New Knob containing the Sleeve onto the Selector Rod.
* Screw Fit & Tighten the small Grub Screws evenly so that the New Knob remains central / not crooked on the Selector Rod.
Look at some of these places for Knobs.
Accessories On-Line
AutoJoy
AutoTek
SAAS
I have this SAAS 19999 knob fitted to my Aspire.
...
Regards: Sam.